autosharding content-topic config (#696)

* chore: add shard choice simulation test

* feat: add new flags for pubsub and contentTopics and deprecate topic flag

* chore: remove store-resume-peer config and comment out functionality until redesign of store is done

* chore: fix code to use contentTopics value

* fix: use default waku topic only if no other topics are provided in the config

cmd/waku/flags.go

@@ -227,10 +227,22 @@ var (
 	})
 	Topics = altsrc.NewStringSliceFlag(&cli.StringSliceFlag{
 		Name:        "topic",
-		Usage:       "Pubsub topic to subscribe to. Argument may be repeated",
+		Usage:       "Default topic to subscribe to. Argument may be repeated. Deprecated! Please use pubsub-topic and/or content-topic instead.",
 		Destination: &options.Relay.Topics,
 		EnvVars:     []string{"WAKUNODE2_TOPICS"},
 	})
+	PubSubTopics = altsrc.NewStringSliceFlag(&cli.StringSliceFlag{
+		Name:        "pubsub-topic",
+		Usage:       "Default pubsub topic to subscribe to. Argument may be repeated.",
+		Destination: &options.Relay.PubSubTopics,
+		EnvVars:     []string{"WAKUNODE2_PUBSUB_TOPICS"},
+	})
+	ContentTopics = altsrc.NewStringSliceFlag(&cli.StringSliceFlag{
+		Name:        "content-topic",
+		Usage:       "Default content topic to subscribe to. Argument may be repeated.",
+		Destination: &options.Relay.ContentTopics,
+		EnvVars:     []string{"WAKUNODE2_CONTENT_TOPICS"},
+	})
 	ProtectedTopics = cliutils.NewGenericFlagMultiValue(&cli.GenericFlag{
 		Name:    "protected-topic",
 		Usage:   "Topics and its public key to be used for message validation, topic:pubkey. Argument may be repeated.",
@@ -301,14 +313,6 @@ var (
 		Value:       true,
 		EnvVars:     []string{"WAKUNODE2_STORE_MESSAGE_DB_MIGRATION"},
 	})
-	StoreResumePeer = cliutils.NewGenericFlagMultiValue(&cli.GenericFlag{
-		Name:  "store-resume-peer",
-		Usage: "Peer multiaddress to resume the message store at boot. Option may be repeated",
-		Value: &cliutils.MultiaddrSlice{
-			Values: &options.Store.ResumeNodes,
-		},
-		EnvVars: []string{"WAKUNODE2_STORE_RESUME_PEER"},
-	})
 	FilterFlag = altsrc.NewBoolFlag(&cli.BoolFlag{
 		Name:        "filter",
 		Usage:       "Enable filter protocol",

cmd/waku/main.go

@@ -49,6 +49,8 @@ func main() {
 		AgentString,
 		Relay,
 		Topics,
+		ContentTopics,
+		PubSubTopics,
 		ProtectedTopics,
 		RelayPeerExchange,
 		MinRelayPeersToPublish,
@@ -59,7 +61,6 @@ func main() {
 		StoreMessageRetentionCapacity,
 		StoreMessageDBVacuum,
 		StoreMessageDBMigration,
-		StoreResumePeer,
 		FilterFlag,
 		FilterNode,
 		FilterTimeout,

cmd/waku/node.go

@@ -27,7 +27,6 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/p2p/enode"
 	dssql "github.com/ipfs/go-ds-sql"
-	"github.com/urfave/cli/v2"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
 
@@ -48,6 +47,7 @@ import (
 	"github.com/waku-org/go-waku/waku/persistence"
 	"github.com/waku-org/go-waku/waku/v2/dnsdisc"
 	"github.com/waku-org/go-waku/waku/v2/node"
+	wprotocol "github.com/waku-org/go-waku/waku/v2/protocol"
 	"github.com/waku-org/go-waku/waku/v2/protocol/filter"
 	"github.com/waku-org/go-waku/waku/v2/protocol/legacy_filter"
 	"github.com/waku-org/go-waku/waku/v2/protocol/lightpush"
@@ -305,6 +305,9 @@ func Execute(options NodeOptions) {
 		addStaticPeers(wakuNode, options.Filter.NodesV1, legacy_filter.FilterID_v20beta1)
 	}
 
+	//Process pubSub and contentTopics specified and arrive at all corresponding pubSubTopics
+	pubSubTopicMap := processTopics(options)
+
 	if err = wakuNode.Start(ctx); err != nil {
 		logger.Fatal("starting waku node", zap.Error(err))
 	}
@@ -318,14 +321,10 @@ func Execute(options NodeOptions) {
 	addStaticPeers(wakuNode, options.Rendezvous.Nodes, rendezvous.RendezvousID)
 	addStaticPeers(wakuNode, options.Filter.Nodes, filter.FilterSubscribeID_v20beta1)
 
-	if len(options.Relay.Topics.Value()) == 0 {
-		options.Relay.Topics = *cli.NewStringSlice(relay.DefaultWakuTopic)
-	}
-
 	var wg sync.WaitGroup
 
 	if options.Relay.Enable {
-		for _, nodeTopic := range options.Relay.Topics.Value() {
+		for nodeTopic := range pubSubTopicMap {
 			nodeTopic := nodeTopic
 			sub, err := wakuNode.Relay().SubscribeToTopic(ctx, nodeTopic)
 			failOnErr(err, "Error subscring to topic")
@@ -435,32 +434,6 @@ func Execute(options NodeOptions) {
 		}
 	}
 
-	if options.Store.Enable && len(options.Store.ResumeNodes) != 0 {
-		// TODO: extract this to a function and run it when you go offline
-		// TODO: determine if a store is listening to a topic
-
-		var peerIDs []peer.ID
-		for _, n := range options.Store.ResumeNodes {
-			pID, err := wakuNode.AddPeer(n, wakupeerstore.Static, store.StoreID_v20beta4)
-			if err != nil {
-				logger.Warn("adding peer to peerstore", logging.MultiAddrs("peer", n), zap.Error(err))
-			}
-			peerIDs = append(peerIDs, pID)
-		}
-
-		for _, t := range options.Relay.Topics.Value() {
-			wg.Add(1)
-			go func(topic string) {
-				defer wg.Done()
-				ctxWithTimeout, ctxCancel := context.WithTimeout(ctx, 20*time.Second)
-				defer ctxCancel()
-				if _, err := wakuNode.Store().Resume(ctxWithTimeout, topic, peerIDs); err != nil {
-					logger.Error("Could not resume history", zap.Error(err))
-				}
-			}(t)
-		}
-	}
-
 	var rpcServer *rpc.WakuRpc
 	if options.RPCServer.Enable {
 		rpcServer = rpc.NewWakuRpc(wakuNode, options.RPCServer.Address, options.RPCServer.Port, options.RPCServer.Admin, options.PProf, options.RPCServer.RelayCacheCapacity, logger)
@@ -507,6 +480,36 @@ func Execute(options NodeOptions) {
 	}
 }
 
+func processTopics(options NodeOptions) map[string]struct{} {
+	//Using a map to avoid duplicate pub-sub topics that can result from autosharding
+	// or same-topic being passed twice.
+	pubSubTopicMap := make(map[string]struct{})
+
+	for _, topic := range options.Relay.Topics.Value() {
+		pubSubTopicMap[topic] = struct{}{}
+	}
+
+	for _, topic := range options.Relay.PubSubTopics.Value() {
+		pubSubTopicMap[topic] = struct{}{}
+	}
+
+	//Get pubSub topics from contentTopics if they are as per autosharding
+	for _, cTopic := range options.Relay.ContentTopics.Value() {
+		contentTopic, err := wprotocol.StringToContentTopic(cTopic)
+		if err != nil {
+			failOnErr(err, "failed to parse content topic")
+		}
+		pTopic := wprotocol.GetShardFromContentTopic(contentTopic, wprotocol.GenerationZeroShardsCount)
+		pubSubTopicMap[pTopic.String()] = struct{}{}
+	}
+	//If no topics are passed, then use default waku topic.
+	if len(pubSubTopicMap) == 0 {
+		pubSubTopicMap[relay.DefaultWakuTopic] = struct{}{}
+	}
+
+	return pubSubTopicMap
+}
+
 func addStaticPeers(wakuNode *node.WakuNode, addresses []multiaddr.Multiaddr, protocols ...protocol.ID) {
 	for _, addr := range addresses {
 		_, err := wakuNode.AddPeer(addr, wakupeerstore.Static, protocols...)

cmd/waku/options.go

@@ -26,6 +26,8 @@ type RelayOptions struct {
 	Enable                 bool
 	Topics                 cli.StringSlice
 	ProtectedTopics        []cliutils.ProtectedTopic
+	PubSubTopics           cli.StringSlice
+	ContentTopics          cli.StringSlice
 	PeerExchange           bool
 	MinRelayPeersToPublish int
 }
@@ -76,10 +78,10 @@ type StoreOptions struct {
 	DatabaseURL          string
 	RetentionTime        time.Duration
 	RetentionMaxMessages int
-	ResumeNodes          []multiaddr.Multiaddr
+	//ResumeNodes          []multiaddr.Multiaddr
-	Nodes                []multiaddr.Multiaddr
+	Nodes     []multiaddr.Multiaddr
-	Vacuum               bool
+	Vacuum    bool
-	Migration            bool
+	Migration bool
 }
 
 // DNSDiscoveryOptions are settings used for enabling DNS-based discovery

examples/basic2/main.go

@@ -29,7 +29,6 @@ func main() {
 		return
 	}
 	contentTopic := cTopic.String()
-
 	hostAddr, _ := net.ResolveTCPAddr("tcp", "0.0.0.0:0")
 	key, err := randomHex(32)
 	if err != nil {

waku/v2/protocol/pubsub_topic.go

@@ -94,7 +94,7 @@ type StaticShardingPubsubTopic struct {
 }
 
 // NewStaticShardingPubsubTopic creates a new pubSub topic
-func NewStaticShardingPubsubTopic(cluster uint16, shard uint16) NamespacedPubsubTopic {
+func NewStaticShardingPubsubTopic(cluster uint16, shard uint16) StaticShardingPubsubTopic {
 	return StaticShardingPubsubTopic{
 		kind:    StaticSharding,
 		cluster: cluster,

waku/v2/protocol/shard.go

@@ -217,7 +217,7 @@ func FromBitVector(buf []byte) (RelayShards, error) {
 
 // GetShardFromContentTopic runs Autosharding logic and returns a pubSubTopic
 // This is based on Autosharding algorithm defined in RFC 51
-func GetShardFromContentTopic(topic ContentTopic, shardCount int) NamespacedPubsubTopic {
+func GetShardFromContentTopic(topic ContentTopic, shardCount int) StaticShardingPubsubTopic {
 	bytes := []byte(topic.ApplicationName)
 	bytes = append(bytes, []byte(fmt.Sprintf("%d", topic.ApplicationVersion))...)
 

waku/v2/protocol/topic_test.go

@@ -1,7 +1,9 @@
 package protocol
 
 import (
+	"math/rand"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/require"
 )
@@ -53,6 +55,65 @@ func TestContentTopicAndSharding(t *testing.T) {
 	require.Equal(t, ct5.Generation, 0)
 }
 
+func randomContentTopic() (ContentTopic, error) {
+	var app = ""
+	const WordLength = 5
+	rand.New(rand.NewSource(time.Now().Unix()))
+
+	//Generate a random character between lowercase a to z
+	for i := 0; i < WordLength; i++ {
+		randomChar := 'a' + rune(rand.Intn(26))
+		app = app + string(randomChar)
+	}
+	version := uint32(1)
+
+	var name = ""
+
+	for i := 0; i < WordLength; i++ {
+		randomChar := 'a' + rune(rand.Intn(26))
+		name = name + string(randomChar)
+	}
+	var enc = "proto"
+
+	return NewContentTopic(app, version, name, enc)
+}
+
+func TestShardChoiceSimulation(t *testing.T) {
+	//Given
+	var topics []ContentTopic
+	for i := 0; i < 100000; i++ {
+		ct, err := randomContentTopic()
+		require.NoError(t, err)
+		topics = append(topics, ct)
+	}
+
+	var counts [GenerationZeroShardsCount]int
+
+	// When
+	for _, topic := range topics {
+		pubsub := GetShardFromContentTopic(topic, GenerationZeroShardsCount)
+		counts[pubsub.Shard()]++
+	}
+
+	t.Logf("Total number of topics simulated %d", len(topics))
+	for i := 0; i < GenerationZeroShardsCount; i++ {
+		t.Logf("Topics assigned to shard %d is %d", i, counts[i])
+	}
+
+	// Then
+	for i := 1; i < GenerationZeroShardsCount; i++ {
+		//t.Logf("float64(counts[%d]) %f float64(counts[%d]) %f", i-1, float64(counts[i-1]), i, float64(counts[i]))
+		if float64(counts[i-1]) <= (float64(counts[i])*1.05) &&
+			float64(counts[i]) <= (float64(counts[i-1])*1.05) &&
+			float64(counts[i-1]) >= (float64(counts[i])*0.95) &&
+			float64(counts[i]) >= (float64(counts[i-1])*0.95) {
+			t.Logf("Shard choice simulation successful")
+		} else {
+			t.FailNow()
+		}
+	}
+}
+
 func TestNsPubsubTopic(t *testing.T) {
 	ns1 := NewNamedShardingPubsubTopic("waku-dev")
 	require.Equal(t, "/waku/2/waku-dev", ns1.String())